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Home / Product Range / Industrial Gears / 45# Steel Spur Gears / M4 Z40 Tooth-Surface-Hardened Heavy-Duty Spur Gear, for Mine Hoists and Heavy-Duty Gear Reducers
  • M4 Z40 Tooth-Surface-Hardened Heavy-Duty Spur Gear, for Mine Hoists and Heavy-Duty Gear Reducers
  • M4 Z40 Tooth-Surface-Hardened Heavy-Duty Spur Gear, for Mine Hoists and Heavy-Duty Gear Reducers
45# Steel Spur Gears

M4 Z40 Tooth-Surface-Hardened Heavy-Duty Spur Gear, for Mine Hoists and Heavy-Duty Gear Reducers

The M4 Z40 spur gear is designed for heavy-duty industrial transmission systems that need high torque output and resistance to severe shock. The 40Cr alloy steel substrate combined with induction-hardened tooth surfaces gives it a very long service life even under harsh, high-load operation.

Item Specification
Module 4
Number of teeth 40
Pressure angle 20°
Material 40Cr alloy steel
Heat treatment Overall quenching and tempering + induction hardening of tooth surface (hardness HRC 48-52)
Pitch circle diameter 160mm
Outside diameter 168mm
Transmission ratio 1:1~6:1
Pitch line velocity ≤10m/s
Machining Gear hobbing / gear shaping, precision-turned fit bore
Key Product Advantages Key Selling Points Applications and Scenarios Contact Us

1. Induction-hardened tooth surface, seriously wear-resistant: Unlike ordinary soft-faced gears, the teeth of this gear are induction hardened (HRC48-52). The very high surface hardness effectively resists pitting and severe wear under heavy loads and greatly extends the gear replacement cycle.
2. Tough 40Cr substrate, resistant to bending fatigue: Made of 40Cr alloy steel with overall quenching and tempering. The core stays very strong and tough, preventing brittle tooth fracture under sudden shock loads or frequent forward/reverse operation, so running is safe and reliable.
3. Large module M4, formidable load capacity: Module 4 means thicker teeth and a larger tooth-root cross-section. Compared with the M3 size, single-tooth bending strength is nearly doubled, making it ideal as the transmission core of high-power reducers or heavy-duty gear pumps.
4. 40 teeth with high contact ratio, smooth transmission: The larger number of teeth combined with the large 160mm pitch circle means more teeth are in contact at the same time during meshing. Operation is smoother, tooth load is spread out, and transmission noise is significantly reduced.

The "tough" first choice for heavy-load equipment: The hard-faced design handles high-load, high-shock conditions and solves the industrial pain point of frequent tooth damage.
High-precision hobbing and shaping: High tooth-form accuracy and precisely controlled meshing backlash reduce energy loss and heat.
Flexible customization: Customer-specified center bore, keyway dimensions, and hub thickness are supported.

Heavy reduction and transmission: Industrial heavy-duty reducers, mine hoists, and metallurgical rolling-mill gearboxes.
Power and pumps: High-flow gear pumps, heavy-duty hydraulic motors, and air compressor drive sets.
Construction and lifting machinery: Crane slewing mechanisms, winches, and large tractor transmissions.
Material handling: Heavy-duty scraper conveyors and drive heads of large belt conveyors.

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About Rentai
Transmission Equipment

Shanghai Rentai Transmission Equipment Co., Ltd. is a manufacturer specializing in R&D, production and export of mechanical transmission components. Our main products include taper lock pulleys, taper lock bushes, timing pulleys, V-belts and timing belts. We also provide OEM & ODM custom service for non-standard transmission parts. Our factory covers over 8000 square meters, with more than 100 employees including 22 technical staff. We integrate casting, machining and finishing, equipped with CNC machines and testing instruments, with an annual casting output of 2000 tons. Supported by complete quality management system and international standards, our products are exported to Southeast Asia, Middle East, Europe and America, delivering reliable transmission solutions for global industrial clients.

  • 10+

    Industry Experience

  • 100+

    Production staff

  • 2000+Ton

    Annual Production

  • 8000+㎡

    Factory Area

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